The primary outcome measure "cumulated pain score during mobilisation for the first 72 postoperative hours" has been used for power calculation. In a previous study the mean for this parameter measured on the visual analogue scale (VAS) for laparoscopic cholecystectomy have been found to be 143 mm (standard deviation 95,7 mm) [2]. Since the pain sensation after laparoscopic cholecystectomy is somatic in origin a MERIDIF of 60% (86mm) have been chosen. Type I and type II errors have been set to 0,05 and 0,20 respectively. This gives a total number of 42 participants with 21 in allocated to either group. To account for potential dropouts and the lack of Gaussian distribution for VAS data there will be included a total of 60 participants with 30 allocated to either group.